Nasty Gal ad banned over "underweight" model
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Such as?
Wet environments seem really bad for us we seem better adapted to temperate dry and hot regions.
How very interesting.
But, as i pointed out in my earlier post.
The Human record for underwater swimming is nearly 250M (And over 20 minutes static breath holding under water!) Which puts Humans far further along the Aquatic spectrum. and puts us much closer to the capabilities of animals like Otters.
So the record for 1 person out of 6 billion is 20 minutes without breathing with extensive training?
Given thid is about adaption not extreme outliers.
How long can you hold your breath under water for especialy while doing soemthing.
Because that's a but better test than the record
Clearly our gills and webbed appendages!
I've never had a problem with this. Most belts come in different lengths. I've a 32" waist and generally get in a 30-34" belt.
That said, I do find a lot of brands seem to have a fit designed for more "portly" gentlemen, especially "fitted" shirts. If you don't have a beer gut it's difficult to find a shirt that doesn't look like a tent.
A very broad term:
Do humans spent part of their life cycle in water? No.
Do humans spend a significant fraction of their time in water as part of their normal behaviour? No.
So humans qualify as a "semi aquatic tetrapod" because many humans eat aquatic animals, almost always without going into water to catch them. I think that's an over-broad definition of "aquatic".
Humans appear to be on the list, like many of the other species, because some human groups would be considered to spend a significant amount of their time on or in the water. The example used is the Samu-Bajau people, many of whom literally live on the water most/all of their lives, and spend a significant proportion of their lives in the water.
That doesn't mean that all humans are though, just that some have adapted to be able to do so (and they appear to have actually adapted, with genetic differences allowing them to spend more time in the water).
Humans are different than most other animals because our behaviour has changed by a massive level over the last few 1,000 years. Judging our species on the last 1,000 years instead of the 2 million that preceded that is negligent.
A lot of our ancestors entered the water. Also note, floating on water is also classed as being semi aquatic and a lot of humans do that with the use of tools.
In that case I guess we're also an avian species eh?
Actually we are heading for an entirely justified thread split here.
AIUI, Modern Humans are really not that different from the handful (Well, large extended family group) of Humans who are reckoned to have passed through the "Gates of Grief" well over 100,000 years ago, And from whom almost all non-African modern Humans are directly descended from.
(Northern Europeans "Might" represent a special case as a consequence of interbreeding with the then, well established, Neanderthal populations (Don't diss the Neanderthals! They were larger, stronger and had significantly bigger brains than the incomers!))
So why did "Culture" and "technology" suddenly take off, out of the Blue, only around 10,000 years ago??
Or did it?
Maybe it was Aliens?? :/
Are we a Space-fairing species?
Holy crap. We're aliens!
1) Our species hasn't existed for 2 million years. More like 200,000. I think you're confusing homo sapiens with homo erectus.
2) While human society (and thus common behaviour) has changed by a massive amount in the last ~10,000 years due to key changes in technology and knowledge (farming, metal working, industrialisation, medical knowledge), that doesn't automatically mean that humans lived in water before then.
By that argument humans are also aerial because a lot of humans fly with the use of tools.
A lot of our ancestors entered water, yes. For short periods of time to wash, acquire certain resources and probably for fun too. But I don't think that qualifies as "aquatic" any more than a kangaroo qualifies as "aerial" because it spends short periods of time in the air.
Actually we are heading for an entirely justified thread split here.
AIUI, Modern Humans are really not that different from the handful (Well, large extended family group) of Humans who are reckoned to have passed through the "Gates of Grief" well over 100,000 years ago, And from whom almost all non-African modern Humans are directly descended from.
(Northern Europeans "Might" represent a special case as a consequence of interbreeding with the then, well established, Neanderthal populations (Don't diss the Neanderthals! They were larger, stronger and had significantly bigger brains than the incomers!))
So why did "Culture" and "technology" suddenly take off, out of the Blue, only around 10,000 years ago??
Or did it?
Maybe it was Aliens?? :/
I'm not saying it was aliens...
...but it was aliens
More seriously, it was farming. Farming --> more food from less people --> larger permanent settlements --> many people specialising in something other than food production --> organisation, trade, writing, culture, research, technology, etc, etc.
Bill Wurtz did a good summary in his superb video "history of the entire world, I guess". I can't link to it because it contains Magic Naughty Words that are banned here. Summarising history from the beginning of time to today in under 20 minutes is a tall order, but he makes an amusing and accurate job of it in a very light-hearted (and quickly spoken) manner.
"Better farming was just invented in a sweet dank valley right in between these two rivers and the animals are helping. Guess what happens next? More food and more people who came to buy the food. Now you need people to help make the food and keep track of the sales and now you need houses and people to make the houses and now there's more people and they invent things which makes things better and more people come and there's more farming and more people to make more things for more people. Now there's business, money, writing, laws, power...society! Coming soon to a dank river valley near you."
Yes, but my point is that it isn't short periods is it.
With relatively little effort in training (As with long distance running etc)
Humans can, with practice and experience, spend really quite considerable amounts of time underwater. Far more than is necessary just to survive slipping and falling in the river.
Long enough indeed to be able to operate as an active and successful underwater predator.
I will actually try the bucket test some time (How long can I hold my breath with my head either in or out of water)
Since I have done no training whatsoever for this I do not expect the results to be impressive. But I would be interested f I can achieve different wet and dry results.
I'm not saying it was aliens...
...but it was aliens
More seriously, it was farming. Farming --> more food from less people --> larger permanent settlements --> many people specialising in something other than food production --> organisation, trade, writing, culture, research, technology, etc, etc.
Bill Wurtz did a good summary in his superb video "history of the entire world, I guess". I can't link to it because it contains Magic Naughty Words that are banned here. Summarising history from the beginning of time to today in under 20 minutes is a tall order, but he makes an amusing and accurate job of it in a very light-hearted (and quickly spoken) manner.
"Better farming was just invented in a sweet dank valley right in between these two rivers and the animals are helping. Guess what happens next? More food and more people who came to buy the food. Now you need people to help make the food and keep track of the sales and now you need houses and people to make the houses and now there's more people and they invent things which makes things better and more people come and there's more farming and more people to make more things for more people. Now there's business, money, writing, laws, power...society! Coming soon to a dank river valley near you."
The thing that gets me is that this could have happened at any time over the last 150,000 years or so. People have been much the same. Same intelligence, same thoughts, same loves and hates, same inginuity, and so on, for all that time. What made it just happen then?
(But then, in the same way, many human groups must have crossed the red sea at the "Gates of Grief" over time. But the genetic record strongly suggests that just One (AND ONLY ONE) of those groups went on to become the ancestors of ALL non-African Humans!!)
It is quite staggering really!
Technology may have had many false starts. The same inventions and discovery's probably happened many times over and then got lost until a minimum number of groups acquired the knowledge.
The development of complex language was the most significant catalyst for our rapid development. Once the fire of technology was well light with communication, it spread fast and was hard to extinguish.
In the same way life on earth for most of it's history was single cell organisms until conditions changed. There were likely many false starts before complex life took a permanent hold.
To be fair species is basic way of trying to classify life, but it's far from ideal it's just the simplest workable solution we have. It's like using a digital record to record an advance analogue history.
There is never a birth that can signify a change of a species.
Anyway the 2 million years is a basic estimate of our ancestors continuous use of water as a habitat, I'm assuming Homo erectus were able to hunt or gather in water. Being semi aquatic just means being able to live in a water based environment, but not on a permanent basis.
They were making tool from 2.6 million years and fire for maybe as far back as 1.7 million years.
That a bit out of date, there is a lot of evidence that main line of humans was out of Africa, but there was a lot of interbreeding between archanic and modern humans. To coin a phrase after a few pints we'd s**g anything.
https://en.wikipedia.org/wiki/Interbreeding_between_archaic_and_modern_humans
I wouldn't count in the same context as that's only achievable with tools where as floating is just made easier, but we can do it without tools.
I think that it is short periods. Aquatic air-breathing animals can remain active underwater for as long as ten hours. Rather longer than the minute or two that humans can remain active underwater for. Even semi-aquatic animals that spend their entire life cycle on land but enter the water often can spend 10 times longer active underwater than humans. Or more.
I'm not arguing that humans have no ability to function in water at all. I'm arguing that it's not enough to consider them aquatic in a meaningful way. Our generalist versatility gives us some ability in many areas, but I think that's not the same as being adapted well enough to be classified that way. Another example comes to mind. Humans can see to some extent in quite low light conditions. It takes time for our eyes to adapt to low light, but after a while we can see enough to get around in quite low light. Humans can also be awake at night if they choose to be or have to be. Humans can also hunt animals by sight, smell and hearing and humans can eat animals. I think that doesn't make us nocturnal predatory carnivores. Not like, for example, a cat.